Bag-valving apparatus



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2 Sheets-Sheet l CARL GKROHMI'LLER. JOHN E. CORNELL.

c. G. KRONMILLER ET AL BAG VALVING APPARATUS Filed Nov. 24. 1926 Nov; 29, 1927.

Nmr. 29,. 1927.

c. s. KRONMILLER ET AL Filed Nov. 24. 1926 2 Sheets-Sheet 2 @ARL 6. KRONM'LLER. JOHIYE '0 mama.

UNITED STATES 1,650,895 PATENT OFFICE.

cam. e. KBONMILLEB AND :romv n. commu, or onrcado, ILLINOIS, assruons 'ro names VALVE BAG serum, or cmcaeo, rumors, a cozaroaarron or wear vrnenvm.

,IBAG-VALVING APPARATUS.

Application filed November 24, 1926. Serial No. 150,507.

one form of our 1nvention;'Fig. 2 is a plan ipw of the same; Fig. 3 is a'detail perspectlve of the apparatus during the creasing step; and Fig. 4 is a perspective of the'valve corner of the bag in the position which it occupies in Fig. 3. p

In the drawings there is shown a bag lying on a suitable support not shown in at tail. In order tOPOSltiOIl the bag properly, it is shown'with its end abutting a stop 11, and its side abutting .a stop 12. The bag may be positioned in any other suit-able manner. a

In the drawin s there is indicated a valver 13, stop 12 constituting one side of the casing for the valver. This portion of the valver forms no part of our present invention and its exact construction is immaterial; however, a suitable form of valver is disclosed in detail in the application of Bates and Dorr for a process and apparatus for folding valves in bags, Serial No. 50, 586, filed August 17th, 1925,; and an application of Bates, Dorrand Dancker for method of and apparatus for severing and valving bag tubes, Serial No. 24,103, filed April 18, 1925.

The form of bag shown in the drawings has a side gusset-fold, the apex of the fold being indicated by dotted line 14. There is also an extension at 'the corner of the bag to increase the extent of the valve flap. The valving apparatus shown comprises clamps 16, which are operated to,hold the bag at the point where they are applied during the valving operation, spreaders 17, which enter the gusset of the bag and are adapted to straighten the gussetfold adjacent the corner of the bag and separate the sides walls of the bag in this way, and a tucking finger 18 adapted to tuck the end of the gusset-fold in between the spread apart sides.

In the constructionshown, there is indicated a shaft 19 connected by a rod 20 to the valving apparatus to actuate; the valver in the desired manner. Any other suitable means may be chosen to operate the valver.

For the more effective formation of the valve, we have added to the apparatus thus tar described an abutment plate 21. This abutment plate might be carried by the clamp 16 and is preferably so carried when the plate extends only to the depth of the valve. In the form shown, the abutment plate is fixed rigidly upon the casing of the valver' and lfas an extending portion 22 which. is curved to conform approximately wlth the normal position of the sidewall of the bag when spreaders 17 are actuated to open the gusset and spread apart the side walls. In the apparatus shown, there is indicated a lower abutment plate 23 similar to the upper abutment plate 21 and 22 just described.

When the spreaders 17 are rocked to the posit-ion in which they are shown in Fig. 3, the gusset-fold is spread apart as shown at 24 in Fig. 4. A The tucking finger is then actuated to fold in valve flap 25 to the position in which it is shown in Figs. 3 and 1.

When the valve flap is folded in to approximately the position to which it is shown in Fig. 4, it will be readily recognized that folds 26 are formed in the bag sides running diagonally across the corner of the original bag. In order to crease the bag walls sufficiently to insure the proper positioning .of. these folds we have provided creaser plates 27 which are adapted to press the bag material against abutment plates 21 and 23 when the bag is in the position in which it is shown in Figs. 3 and 4. These creaser plates 27 are mounted upon a carrier. 28 which 1s curved to receive the bag extension. This shaping of the mounting for plates 27 is in order to avoid the necessity of moving the plates through too great a distance.

Carrier 28 is shown mounted upon a rod 29 carried in guides 30, mounted on a bracketat to lever 34 and carries at its other end a head 41 having a slideway 42 to receive the end of shaft 19. A roller 43 on head 41 enters cam groove 38 and is actuated thereby to operate rod 39, lever 34, andcreaser plates 27 in timed relation with the operation of the valvin mechanism.

It will Ive understood that the operative parts are so timed that the creaser plates press the opened-up bag against the abutment plates while the spreaders are open, as shown in Fig. 3. The distance between the abutment plates and the creaser plates is so adjusted that the paper will be pressed enough to properly locate the folds, but care is taken to avoid such heavy pressure as would seriously weaken the paper along the fold lines.

The curved extension 22 of the abutment plate assists in causing the bag toopen up smoothly, and in avoiding wrinkles which might result in improper positioning of the walls at the corner of the valve during the creasing operation. If the abutment plates and creasers are omitted, there is danger of folds, especially the folds along lines 26, be ng improperly located. This is particularly true if some means is not employed to ress these folds while the bag is still held y the valving apparatus.

It will bennderstood that means for pressing folds 26 in the position shown might be devised otherwise than disclosed in the drawings. For example, plates 27 might be hinged to abutment plates 21 and 23, and

' merely swung to perform the pressing operation; or two plates mightbe hinged together just outside the lines where folds 26 are formed, and closed together at proper times.

In its broadest aspect, our invention also contemplates pressing the bag material to form proper folds after Spreaders 17 have been returned to their original position, but while the corner of the bag is still in position upon the Spreaders. There is less danger of improper location of the fold lines if the bag is pressed at this time than there is if it is removed from the valver before any steps are taken to permanently locate the fold lines. It will be obvious that this result might be achieved by hinging plates 27 upon carrier 28 and swinging them down to clamp the bag corner between them at proper intervals.

Other obvious changes may be made in the apparatus shown and described, within the scope of the appended claims.

\Vhat we claim is:

1. In apparatus for valving bags, means to fold one corner of the bag in between the side walls of the bag to form a valve, and means to crease the bag walls along fold, lines while the bag is in position on said folding means.

2. In apparatus for valving gusseted bags. means for opening the gusset fold adjacent one corner and thereby spreading the side walls of the bag apart, and means to crease said side walls along desired lines while they are so spread apart.

3. In apparatus for valving gusseted bags. valve-forming means adapted to enter the gusset fold near one end of the bag, and means for creasing the bag along fold lines while the bag is in position upon the first said means.

4. In apparatus for valving bags, means to spread apart the side walls of the bag near one corner thereof and abutment plates out side of the bag againstwhich said walls are spread, said plates being shaped to conform to the desired position of the outside of the bag walls when they are spread apart.

5. In apparatus for valving bags, means to spread apart the side wallsof the bag near one corner thereof and abutment plates outside of the bag against which said walls are spread, said plates being shaped to conform to the desired position of the outside of the bag walls when they are spread apart, means for folding a valve in the bag while the walls are thus spread apart, and means for pressing the said walls along fold lines of the valve against the abutment plates.

In testimony whereof, we have hereunto signed our names to this s cification.

CARL G. KRONMILLER. JOHN E. CORNELL. 

